The TARZAN show at AK was my favorite attraction out of all four parks, HANDS DOWN! The skating, the acrobatics, the dancing, the music (the lead singer looked a lot like my uncle!), the atmosphere, the staging, the props- EVERYTHING worked- it was always a fabulous, fun show that was such an experience. We often saw it twice in one day. It will RIP forever in my heart...
because that Nemo show they replaced it with is AWFUL! The songs are ever so annoying- it RUINED Finding Nemo for me altogether.
Ahh, but I digress.
More guilty pleasures for me, as a couple others have said, would be Maelstrom (it's the one flume ride my mom can handle, so we go on this a couple of times- the movie at the end is really cool too) and Carousel of Progress (it's a cute, funny little movie, and the air-conditioning is really great!).
I'd also have to say the Tomorrowland Transit Authority, the Blue Line that runs through Tomorrowland! It's a great breather, but I really like how you can kind of spy on other parts of the park. It's a favorite.
Also, Flights of Wonder (the bird show in AK- do they still do that?). I really loved seeing all of the birds and seeing the 2-year-old's reaction to everything. I haven't been to see it in forever. However, the uncle with the bird phobia wasn't so happy...